Black Guardian

The Black Guardian is a character in the long-running British science fiction television series Doctor Who, portrayed by Valentine Dyall. He is an anthropomorphic personification of the forces of entropy and chaos, the counterpart of the White Guardian, a personification of order. The two Guardians balance out the forces in the universe, although the Black Guardian seems to desire to upset the balance in favour of chaos and evil while the White Guardian prefers to maintain the status quo.

Black Guardian: I expected no less of you! You whimpering wraith! But your death is already compassed in my designs. For now, the Doctor shall release the key to ME, and chaos shall break upon the universe!